Operational Amplifier Tutorials list(Op Amp)

What are operational amplifiers?

Operational amplifiers, also called op-amps, were originally designed to perform mathematical operations in analog computers, such as addition, subtraction, multiplication, division, integration, differentiation, etc. It is from this initial application that it gets the name “operational amplifier”, because the idea was that it originally performed the operations mentioned.

A Brief History of the Op-Amp

Op Amp stands for operational amplifier. The operational amplifier was developed in the early 1940s for use in analog computers. The first op-amps used vacuum tubes, which were very large and very power-hungry.

In 1967, Fairchild Semiconductor introduced the first operational amplifier in an integrated circuit package, reducing its size, power consumption, and price. This device is a high-performance linear amplifier with a wide range of applications.

Basic operation of the operational amplifier

The operational amplifier has:

An inverting input, labeled with a minus sign (V–), where the applied signal remains in phase with the output.
A non-inverting input, labeled with a plus sign (V+), where the applied signal is phase-shifted by 180 degrees with the input.

An output that delivers the amplified difference between the two input signals. Voutput = A(V+ – V–). Where A is the open-loop gain of the operational amplifier, which is between 100,000 and 1,000,000. This large gain can be controlled with a suitable feedback network.

Characteristics of an Ideal Op-Amp

Infinite gain
Infinite input impedance (Zin), meaning it draws no current from the signal source.
Zero output impedance (Zo), meaning it can deliver a large amount of current to the load without voltage drop.
Infinite bandwidth.
No output offset errors.

These characteristics, with some limitations, are very similar to those of a real operational amplifier.